Blueair filters trap six times more dirt than filters in typical air purifiers - 99.97% of 0.1 micron particles on the lowest setting.Blueair's 3-Stage Progressive Filters have three layers composed of millions of ultra thin fibers. The first layer captures pollen and dust, and the second and third layers capture smaller particles like exhaust and bacteria.Blueair filters are made of non-toxic polypropylene. This filter fiber is waterproof and thus bacteria, virus, and mold-resistant - eliminating the need for harsh chemical additives and washes. After their service life, a Blueair filter is 100% biodegradable.This unique design resists clogging and enhances filtration at peak performance levels for longer periods of time. BlueAir filters require no weekly additives or washing and are easily replaced. Simply open the lid to your air purifier, lift out the old filters and drop in the new ones.

Product Dimensions: Inches 13x 9.5x 8.5.

Filter Efficiency is 99.97% of 0.1 micron particles on Speed One.

Three standard HEPASilent filters of polypropylene (traps particles).

To prolong filter life and improve efficiency, filters can be vacuumed.

Blueair filters are made of non-toxic polypropylene.